I saw that thou camest not When the seventh day was come, and a good part of it was past, I concluded thou wouldst not come that day. I have not made supplication Hence it appears that sacrifices were accompanied with solemn prayers. I forced myself I did it against my own mind and inclination: I offered a burnt-offering lest my enemies should attack me before I had commended myself and my cause to God, and entreated his aid and blessing.
Related Commentaries of 1 Samuel 13:11
1 Samuel 13:11-12
11 And Samuel said, What hast thou done? And Saul said, Because I saw that the people were scattered from me, and that thou camest not within the days appointed, and that the Philistines gathered themselves together at Michmash;
12 Therefore said I, The Philistines will come down now upon me to Gilgal, and I have not made supplication unto the LORD: I forced myself therefore, and offered a burnt offering.